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NASH cunas, oNoHArnL- HILL, NORTH CAROLINA.

Letters Patent No. 80,599, dated August 4, 1868 antedated July 30, 1868.

IMPROVEMENT IN BUReLAR-ALARM Locas.

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ToALL WHoM 1T MAY ooNcERN:

Be it known that. I, NASH CEEK, of Chapel Hill, in the county of Orange,and'State of North Carolina, have invented a new and improvedAlarm-Lock;and that the following description, taken in connection with theaccompanying drawing, hereinafter'referrcd to, forms a full and exactspecification of the same, wherein I have set forth the natureand,principles of my said improvements, by whichmyinvention may bedistinguished from all others of a similar class, together with` suchparts as I claim, and desire to have secured to-me by Letters Patent.

This invention relates to a lock, of simple construction, which isdesigned to be unpickable, and capable of being applied in all caseswhere an ordinary lock may be used, and in combining with said lock analarm, all arranged as hereinafter fully shown and described. i

The accompanying drawing represents an internal view of my improvedloch/with the alarm attached.

`A represents the case -ot' the lock, which may be of.V the lusualrectangular form, and B is the bolt, fitted withinthe case' in suitableguides, and having a spring, C, bearing against its upper edge, which,spring has 'a tendency, when the bolt is shoved outward, to keep anotch, a, in the lower edge of the bolt, on the lower part of the backguide b of the bolt, so as to involve the' necessity. of raising theback part of the holt before it can Y he shoved back.

In the back part of the bolt B there is a. hole, c, which, when the boltis shoved forward and the lock locked, receives a pin', d, at the end ofa spring, D, which is secured within the case A." The elasticity -of thespring D keeps the pin @Zin the hole cfofthe bolt B, and saidpinconsequently must be removed from o'rshoved 4out of the hole c-beforethe bolt can be shoved hack.

This result is effected by the bit of the key, which, as it is'turned inthe lock, presses upon the spring D,

`and throvrsitsfpin d out from the hole in -the bolt justY previous tothe bit entering-al notch,y e, in the bolt, by

which the inner end ofthe bolt is raised. free from thc rear guide 6,and the'holt thrown back and the lock unlocked. i i

In the lock-case A there is a circular chamber, E, in which the hit ofthe key, works, and there is also Y within the lock-case a lever, FX,yhaving its fulcrum atf, and its lower end connected by a link, g, witha lever, li, whose lower end is 'pivoted to the bar a', which passesIthrough an opening in' the lock-case.

E represents the door or shutter to which the lock is applied, and F isa sliding bar attached thereto, and having a. lever, G, connected to itsupper end by `a pivot, j, the fulcrum of said le-verheing ataX.

On one end oi' this lever 'a spring, lc, bears, andthe opposite end isprovided with a'tooth, which `catches into a toothed wheel, H, the shaftI of which has a cord, J, attached, with a weight, K,vat its lower end.

This shaft I-has a drum, L, upon it, provided with radial teethm,vwhich, when the shaft is rotated, come in contact with an arm, L', ona'shaft, M, to which a bell-hammer, N, is attached. Q he shaft M has aspring, O, connected to it, which `spring hasla tendencyv to throw thehammer Lin contact with the hell P, the hammer being thrown hack .fromthe hell by the action of the teeth m against the arm L of the shaft M.

The tooth l of lever G serves to retain the wheel I-I, and prevent theweight K from rotating it when the cord J is wound-upon the shaft I. A

The bar F has a pin, n, projecting from it, and Q is a gun or pistolattached to the shutter or door, in such a positign that the pin n4 willbe in front of its trigger o when the lock is locked, and the bar F isheld upward by a notch, p, in its lower end, receiving a pin, q, intheshutter erdoor, as shown in the drawing.

The operation is as follows: When the lock is in a locked state, the ping in the recess or notch p in the` bar F,Iand the cord 'J wound upon theshaft I', the alarm is set,an d it will be seen that when the'bolt B isthrown back, and the lock unlockeda lip, bx, on .the bolt will strikelever FX,.and the bar t' will be moved, and strike the bar F and `throwit o' 'or free from the pin q, and the spring k will then, by itspressure on'lever G, throwi down the bar F and raise the'tooth l fromthewheel H. The weight .K will then, of course, rotate the shaft I, andthe bell P- willl be sounded. The gun or pistol Q will also be fired, inconsequence of the pin 'n striking the trigger o when the bar F isforceddown.

In addition to these alarms, an ordinary bell, R, provided with a'cla'pper, r, maybe attached to the end of the shaft M. The shaft M isprovided witha'n arm, s, to come in contact with a pin or stop, t, intheshutter Vor door E.

Only one or all of these alarms may bc used, as desired.

. In order to prevent the insertion of a key into the lock from theouter side of the door, a slideplate, S,

may be placed within the lock, and operated by a lever, '.l. A

This slide-plate is not new, however, and may be seen in various locks.Having thus described my invention, I claim as new, and desire to secureby Letters Patent- 1. The lever EX, connected with the bar z', as shown,in combination with the sliding bar F at theouter sidev ofthe lock, andattached to the shutter or door, and arranged so as to operate an alarm,substantially as shown ,and described.

2. The lever G, pivoted to the bar F, in connection with the spring k,toothed wheel II, cord J, and weight K o'r an equivalent, arms m .on thedrum of the shaft I, shaft M with arm L and bell-hammer N attached,

spring O .and bell P, all arranged' and combined to operate inconnection with the lock, substantially as set forth.

NASH CHEEK.

Witnesses:

' Taos. F. CHEEK, D. McCAULnY.

